2Ng YL,Glennon JP,Setchell DJ,et al.Prevalence of and factors affecting post-obturation pain in patients undergoing root canal treatment.Int Endod J,2004,37:381-391.
3Saunders WP,Saunders EM.Effect of noncutting tipped instruments on the quality of root canal preparation using a modified double-flared technique.J Endod,1992,18:32-36.
6Noiri Y, Ehara A, Kawahara T, et al. Participation of bacterial biofilms in refractory and chronic periapical periodontitis [ J ]. J Endod, 2002,28 (10) : 679 - 683.
7Costerton JW, Stewart S, Greenberg EP. Bacterial biofilms : a common cause of persistent infections[J]. Science, 1999,284(5 418): 1 318- 1 322.
